Journal
CHEMICAL SCIENCE
Volume 10, Issue 11, Pages 3257-3263Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc04252g
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Funding
- National Natural Science Foundation of China [21601069, 51672114, 21531004, 91433201]
- Natural Science Foundation of Jiangsu Province of China [BK20160552, BK20161357]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province [16KJB150011]
- Postdoctoral Research Foundation of China [2017M611746]
- Jiangsu Postdoctoral Research Foundation [1701115B]
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A novel family of B-and N-embedded phosphorescent iridium complexes has been prepared. Single crystal structures indicate that the B-embedded polycyclic unit exhibits better planarity than the N-embedded polycyclic unit, which leads to different p-p-stacking and electrical characteristics. More importantly, by controlling the number of boron or nitrogen atoms embedded, solution-processed OLED devices incorporating these emitters as emitting layers can achieve a phosphorescence color variation from green to deep red (638 nm) and show low-efficiency roll-off and turn-on voltage. In particular, the Bembedded complex Ir-BB shows good color purity with a narrow full width at half maximum (1211 cm(-1)) and CIE coordinates (0.67, 0.31) in the deep red light region. Notably, B-embedded iridium complexes can also react with two different Lewis bases (pyridine and DMAP) to form intriguing B-N Lewis adducts through different coordination modes. During this process, significantly different structural and optical changes are triggered by the structure and electronic properties of Lewis bases, as confirmed by X-ray crystallographic, 1H NMR and spectral analysis.
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